The coyote, Canis latrans, originally found only in the western United States, has followed man and his live-stock south to Costa Rica, east to the Atlantic, and north into Alaska. It is the principal predator of sheep in California. (Cover photo by Barbara Butler)

Over the years, many people contributed to this research, which has been part of Western Regional Project W-123 and Western Regional Cooperative Committee 26. Special thanks go to the U.S. Sheep Experiment Station, Dubois, Idaho, to USDA-ARS, USDA Special Grants, and to the California legislature for funding much of this research. The authors thank the following for their cooperation: Alfred H. Murphy, Superintendent, UC Hopland Field Station; Douglas A. Barnum, Barbara A. Butler, Ann M. Casler-Fagre, Guy E. Connolly, Maynard W. Cummings, Daniel B. Fagre, William M. Longhurst, Sheila McKenna-Kruse, Gary E. Nesse, Robert H. Schmidt, Robert M. Timm, Mark Tobin, Dale A. Wade, Edwin L. Murphy, Thomas H. Schuitz, and Donald J. Stern. All chemical compounds tested were obtained from the Western Regional Research Center. Animal Damage Control of U.S. Fish and Wildlife Service provided much advice and assistance.